Federal Premium has a proven record for reliable, trusted ammo. They designed these total synthetic jacketed (TSJ) rounds to mirror the feel and performance of their Premium HST lines, so you can train to use the HST line with less lead exposure, and less of a cost to your wallet. These Federal Syntech rounds feature the Federal-exclusive Catalyst primer which will fire reliably, without lead. Another advantage of polymer coated ammo is that your barrel will experience far less metal fouling, damaging heat and friction, as the polymer is malleable and is said to actually clean the barrel as it passes through. Federal has created a line of ammo that is well suited for clean, safe, indoor training.